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In this study, a series of novel nickel catalysts supported on reduced graphene oxide nanosheets (Ni/rGO) with Ni loadings of 10, 15 and 20 wt% were successfully synthesized via the incipient wetness impregnation method. The physicochemical properties of the catalysts and rGO support were thoroughly characterized by thermogravimetric analyser, X-ray diffraction, fourier-transform infrared spectroscopy, Raman spectroscopy, N₂ adsorption-desorption, temperature programmed reduction, temperature programmed CO₂ desorption and field emission scanning electron microscopy with energy dispersive X-ray spectroscopy. The properties of the catalysts are correlated to its catalytic activity for CO₂ methanation which were investigated using three-phase slurry reactor at low temperature and pressure of 240 °C and 10 bar, respectively. Among the three catalysts of different Ni loading, Ni₁₅/rGO shows the highest activity of 51% conversion of CO₂ with total selectivity towards CH₄. N₂-physisorption and CO₂-TPD analysis suggest that high catalytic performance of Ni₁₅/rGO is attributed to the high surface area, strong basic sites and special support effect of rGO in anchoring the active metal.